"quicker" in the adjective sense
1. quick, speedy
accomplished rapidly and without delay
"was quick to make friends"
"his quick reaction prevented an accident"
"hoped for a speedy resolution of the problem"
"a speedy recovery"
"he has a right to a speedy trial"
2. flying, quick, fast
hurried and brief
"paid a flying visit"
"took a flying glance at the book"
"a quick inspection"
"a fast visit"
3. agile, nimble, quick, spry
moving quickly and lightly
"sleek and agile as a gymnast"
"as nimble as a deer"
"nimble fingers"
"quick of foot"
"the old dog was so spry it was halfway up the stairs before we could stop it"
4. quick, ready
apprehending and responding with speed and sensitivity
"a quick mind"
"a ready wit"
5. immediate, prompt, quick, straightaway
performed with little or no delay
"an immediate reply to my letter"
"a prompt reply"
"was quick to respond"
"a straightaway denial"
6. quick, warm
easily aroused or excited
"a quick temper"
"a warm temper"
"quicker" in the adverb sense
1. quicker, faster
more quickly
Source: WordNet® (An amazing lexical database of English)
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